Method and means for luting molds



March I7. 1925. a

' E. F. BEGTRUP METHOD AND MEANS FOR LUTING IIOLDS Filed Oct. 24, 1922 s Shqets-Sheet' 1 Mzau'ah 17, 1925.

E. F. BEGTRUP' METHOD AND" HEANS FOR LUTING HOLDS Filed 001.- 24, 1922 3 Sheets-Sheet 2 IN VEN TOR To all whom. it may concern:

Pa tentedMar. 17, 1925 r I UNITED sTATEs PATENT-OFFICE.

EDWARD F. IBEG'I'RUP, OF JERSEY NEW JERSEY, ASSIGNOB TO ME'FALZik THER- MI'I CORPORATION, OF CHROME, NEW JERSEY, A. CORPORATION OF NEW JERSEY.

. METHOD AND MEANS FOR LUTING HOLDS.

Application filed October 24, 1922. Serial 1T0. $8,602.

Be it known that I, EDWARD F. Bncraur, a citizen of the United States, and a resident'of J ersey-City, in the county of Hudson and State .of New certain new and useful provements in Methods and Means for Luting Molds; and

4 I do hereby declare the'following to bee.

pressing and condensing. the molding mate full, clear, andexact description of the invention, such as will enable others skilled in the 'art to which it appertains to make and use the same. 4

The invention relates toa novel method and means forluting or sealing molds made of sand or the like, to prevent the material cast in the molds escaping between the part-- ing surfaces of the mold sections, viz, the surfaces of the 'mold which are in mutual engagement, or in engagement with the surfaces of metal pieces partially enclosed 'and extending outside of theimold. To this end,-

the invention comprises additionally comrial adjacent the parting surfaces .of the mold sections after the latter have been regularly formed and assembled, such additional compression being effected by providing the flask sections in which the mold. sections are formed with flanges on their inner faces adjacent the parting surfaces of. the mold I sections, forming the mold sections in the flask sections with their partin jecting a slight distance beyond t e marginal edges of the flask sections, assembling the mold sections, and applying pressure to the flask sections toforce the latter together;

. thereby causing the material of the matin mold sections between the parting faces an the flanges'to be strongly compressed and the parting faces to be forced together or into engagement with the faces of the metal pieces under suificiently heavy pressure to prevent the escape of fluid material poured into the mold.

The invention isillustrated in the accompanying drawings, in which, Fig. 1 is a perspective view of a half flask or box section adapted to be used in the operation of welding the ends of girder rails together by means of superheated molten steel or iron;

Fig. 2 is a 'side elevation of one-half of a mold section in course of preparation;

Fig. .3 is .an end elevation-of the mold as' initially applied to the rail ends; 7 7

J erse have inventedor the tion of the faces pro- Fig. 4'is a side elevation ofthe same;

Fig. 5 is a view similar to Fig. 3,.showing the application of the clam ing meansfor compressing themoldmaterial to effect the luting or sealing; Fig. 6 is a horizontal sectionon line -6 of Fig. 5. v

It will be understood that the particular exemplification of the invention as represented in the drawings is that of a mold for effecting the welding of the ends of rails ike bymeans of superheated metal poured into the mold which surrounds and encloses the rail ends, and in the descriparticular invention it will be understood t at the same principles of con struction and operation apply to any mold involving separable sections formed of compacted loose material, such as sand, or an admixture of sand and clay, or other materials ordinarily used for this purpose.

Referring to the drawings, 1 indicates one side members 2 are cut out to provide open-- ings 5 conforming to a half vertical section of the rail to be welded, and the rear of the casing is left open. a-

Secured to each of the inner faces of the side walls 2, 2, and spaced from and generally parallel with the edges of the openings 5, is a flange 10 normal to the surface of the corresponding wall 2. It will be understoodthat two of these flask sections,

-similarly constructed, are employed in form ing the welded joint between. rail ends by the method hereinbefore indicated, and that these twd flask sections containing the moldforming material are clamped about the rail ends, in which position the flanges 10 on the side walls of each'flask section will constitute continuous rims substantially conforming to the cross-section of the rail and spaced from .the rail at all points, as more particularly indicated in Figs.3 and 5.

In constructing the mold proper, each half flask section is laced on a. backboard 6 with a pattern defining one half of the mold cavity, resting on the backboard and extending through the registering openings 5 in the front edges of the flask section. The. flask section is elevated from the top surface of the backboard by placing spacers or shims 7 under the edges of the flask section, as shown in Fig. 2. The sand or other refractory material is then filled into the flask section and thoroughly rammed or tamped therein to completely fill the flask section and extend beyond the front edges thereof, as at 8, a distance equal to the thickness of the shims 7.

When the two mold sections have been thus formed, the flask or box sections containing the same are placed about the ends of the rails which are to be welded-together by the superheated molten metal poured into the cavity 25 (see Fig. 6 which surrounds and separates the ends of the rails.

With particular reference to Fig. 3, it will be noted that when the mold sections are brought into initial engagement with the rail ends, the projecting portions 8 of the molds are in contact with, each other and with the surfaces of the rail ends. The initial contact between the parting surfaces of the mold sections is not suflicient, however, to prevent the molten metal escaping, and in order to prevent this condition, it has been customary, heretofore, to provide special luting means, either on the outside of the flask sections covering the parting lines, or to apply strips of refractory material soaked in an adhesive, such as molasses, about the rail ends, so that when the sections of the split mold were pressed together the luting strips of asbestos or the like would be compressed between the adjacent faces of the rail sections and the mold surface to seal the joint in the mold against leakage. jectionable, the first, because it frequently results in the formation of fins caused by metal escaping from the interior of the mold, entailing a waste of the welding metal and also producing an unsightly joint; and thesecond, because of the difficulty of applying the sticky luting strips to the surface of the rail and the general objection to handling material of this character. It also frequently occurred that the luting means, as th'us applied, would rupture or break, resulting in a leakage or run-out of themoltenmaterial and a consequent defective or incomplete joint.

The present invention is effective in overcoming all of these difiiculties, and also in avoiding the application of separate lutin means, the refractory material and the mol sections adjacent the parting surfaces beingso applied as to produce an eflective luting or sealing action at'all points where leakage of the molten metal would be likely to occur. To produce this condition of the mold material, at and adjacent the parting surfaces of the mold, the .flask sections 1 surrounding the rail ends, as shown in ,Fi

3, are forced toward each other by suitab e Both of these methods are obextending beyond the edges of the flask scctions, which include the parting surfaces of the mold sections, backward toward the flask sections until the marginal edges of the latter come in contact with each other and with the rail sections. It is evident that the mold material will readily move back into the flask sections at all points except where the flanges 10 are interposed. As these flanges project into the body of the mold material, it is evident that the relative movement of the flask sections will cause a heavy compressive force to be exerted by said flanges on those portions of the material of the mold lying between said flan es and the parting surfaces of the mold, or the surfaces of the rail ends. In other words, the entire body of the molding material enclosed Within the continuous flanges 10 and the parting surfaces of the mold sections, which are in engagement with each other or with the surfaces of the rail, is

engaglng surfaces maintained under sufliciently heavy contact pressure to prevent any leakage of the molten metal delivered to the mold between the respective engaging surfaces of the mold, or between the engaging surfaces of the mold and rail ends.

Under certain conditions, the initial clamping of the flask sections will produce a suflicient pressure between the protruding surfaces 8 of the mold to prevent leakage, but the latter condition is absolutely assured when the final clamping of the flask sections is brought about, as the relative movement between the flask sections and the enclosed mold sections causes the flanges 10 to produce a very much heavier compressive force on the material of the mold confined between the flanges and the opposing surfaces of the rail ends, as illustrated in Figs. 5 and 6. In this particular exemplification, it will be noted that the portionsinvention as applied to a mold for eflecting the welding together of .the ends of rails by the action of thermit steel or superheated steel produced in the electric furnace, is

merely exemplary, and, it will be understood that the invention is not limited to this particular field, but is applicable to all molding and casting operations involving the use of split molds made of refractory material, such as sand or the like, which require the application of special luting means to preventleakage between the parting surfaces of the mold, and by applying the principles of construction and operation, as hereinbefore described, including the initial formation of the mold sections with portions protruding or projecting beyond the marginal edges of the. flask, and providing the latter with flanges to effect a super-com- .pression of the moldin mate-rial within the area defined by the anges, it is evident that the material of the mold sectionsadjacent the parting surfaces Will be compressed and the mating-surfaces pressed together with suflicient, force to preclude any possibility of leakage of the material delivered to the mold.

What I claim is: i

1. The method of luting or scaling split molds of sand or the like which comprises additionally compressing the mold material adj acent the parting surfaces after the mold has been assembled.

2. The method of luting or sealing split molds of sand or the like which comprises forming the mold sections in separate flask sections with the parting surfaces projecting beyond the flask edges, assembling the sections, and applying pressure to the flask sections to force the same together; tl'iercbyadditionally compressing and condensing the mold material in the parting surfaces and forcing the latter into intimate contact with the contiguous surfaces.

3. The method of luting or sealing split molds of sand or the like which comprises forn'iing flask sections with flanges adjacent the parting surfaces of the mold, forming the mold sections over patterns in the flask sections with the parting faces of the mold sections projecting beyond the' marginal edges of the flask sections, assembling the mold containing flask sections, and applying pressure to the flask sections to produce a relative movement between the same and ,the contained mold sections; whereby the material of the mold sections between the flanges and the parting surfaces willbe additionally compressed and said parting surfaces forced into intimate contaetwith thecontiguous surfaces.

A mold comprising mold sections .of tamped sand or the like having zones in and adjacent the parting surfaces additionally compressed when the sections are assembled.

5. A mold comprising mating flask secjacent the parting surfaces of the mold, and

mold sections of sand or the like in the respecti've flask sections, said mold sections having their parting surfaces projecting be yond the marginal edges of the flask sections. v

7. A mold comprising mating flask sections having flanges on their inner faces adacent the parting surfaces of the mold; a

mold sections of sand or the like in the re spective flask sections, said mold sections having their parting surfaces projecting beyond the marginal edges of the flask sections, and means for forcing the flask sections together.

8. A mold comprising mating flask sectionshaving flanges on their inner faces adjacent the parting surfaces of the mold, mold sections of sand or the like in the respective flask sections having their parting surfaces projecting beyond the marginal edges of the flask sections, and clamps engaging the flask sections for forcing the latter together.

by means of superheated molten metal, comprising-flask sections adapted to enclose the rail ends, refractory mold sections in the respective flask sections having portions adjacentthe rails extending beyond the flask edges, and means for forcing the flask sections together;-whereby extra compression of the mold material at the parting surfaces will be effected. j

10. A mold for forming welded rail joints by means of superheated molten metal, comprising flask sect-ions having flanges on their inner faces spaced from and substantially corresponding in shape to the contour of the rails, refractory mold sections in the respective flask sections having portions adjacent the rails extending beyond the flask edges, and means for forcing the flask sections together; whereby extra compression of the mold material at the parting surfaces will be effected.

11. A flask or casing for split molds com- 9. A mold for forming welded rail joints prising mating flask sections having flanges 

